If you’ve ever stood over the bait aisle at a tackle shop, squinting at a wall of tiny metal lures labeled “1/8 oz,” “1/4 oz,” “1/2 oz,” and wondered why a fisherman would pay so much attention to such a small number, I get it. Early in my career as a jig head supplier, I had a customer call me in a panic, saying a batch of our 3/8 oz jig heads he’d ordered were “sinking way too fast—they’re scaring the fish.” I’d always just assumed weight equals sink rate, right? If a lure was marked 3/8 oz, it sank at the speed that 3/8 oz metal should. That conversation set me back to my garage workshop, where I spent a week testing every variable that makes a jig head sink faster or slower, and I learned that sink rate isn’t just about weight. It’s about a mix of physics, design, water conditions, and even how you fish the lure. Today, I’m pulling back the curtain on how we at our facility determine the sink rate of every jig head that leaves our warehouse, no guesswork involved. Jig Heads
First, let’s start with the basics: what exactly is a jig head’s sink rate? For anyone new, sink rate is simply how fast a lure falls through the water, usually measured in inches per second (ips). It sounds straightforward, but it’s the make-or-break detail for anglers. If you’re fishing deep in cold water where bass hold tight to structure and don’t want to move far, you need a jig head that drops slow enough to let the bass see it—too fast, and it’ll sail past their hiding spot before they can react. If you’re fishing shallow, murky water with strong currents, a too-slow sink rate means your lure will be swept away from the fish before it gets down, leaving you with nothing. That’s why getting sink rate right isn’t just a quality control step for us—it’s how we help our customers catch more fish.
The first and most obvious variable we test is mass, or more specifically, the total weight of the jig head including the hook and paint. It’s not just the lead (or tungsten, which is a popular alternative these days) core that counts—every component adds to the mass that pulls the lure down. For example, a 1/4 oz jig head with a size 2 hook will sink slower than a 1/4 oz jig head with a size 1/0 hook, because the larger hook adds a little extra mass, but not enough to make a dramatic difference. Where we really see a change is moving between half-ounce and one-ounce weights: a one-ounce jig head will have roughly double the mass of a half-ounce one, so it sinks almost twice as fast—all else being equal. But here’s the catch: lead and tungsten have different densities. Tungsten is about 1.7 times denser than lead, so a tungsten jig head of the same actual weight as a lead one will be smaller in size. That smaller size means less water resistance, so it sinks faster than a lead jig head with the same labeled weight. That’s a common mistake new anglers make—they buy a 1/2 oz tungsten jig thinking it’ll fish the same as a 1/2 oz lead one, and it drops too fast. We test this every time we run a production batch, weighing each jig head on a precision scale calibrated to within 0.01 oz, then we do a side-by-side sink test with both materials to make sure our labeled weights match the actual feel anglers get on the line.
Next, we look at shape and profile, and this is where most suppliers cut corners, but it’s the second biggest factor in sink rate. A round, cylindrical jig head will sink differently than a teardrop-shaped one, right? We test this by designing molds with three common shapes—round (for flipping and pitching), streamlined (for swim jig heads), and pancake-style (for finesse worm rigs)—and running them at the same weight and material to eliminate variables. Here’s what we found: a streamlined teardrop shape has way less drag in the water than a round shape, so it sinks roughly 15-20% faster, even at the same weight. The pancake shape, which is flat on the sides, acts like a tiny parachute in the water, so it sinks the slowest of the three—perfect for finesse fishing where you need that gentle fall. We also test skirted jig heads, the kind that have silicone or rubber skirts around the hook. A thick, full skirt adds a lot of surface area, so it increases drag, slowing the sink rate by up to 25% compared to an unskirted jig head of the same weight. That’s why we always note whether a jig is skirted or not in our product descriptions—we don’t want an angler to buy a skirted 1/4 oz jig expecting it to fish like an unskirted 1/4 oz one.
Water conditions are another huge variable that we can’t control, but we do factor in when testing. Sink rate isn’t the same in a fast-moving river as it is in a still lake, and it’s different in saltwater than freshwater. Saltwater is denser than freshwater—about 2.5% denser, to be exact—so a jig head will sink slightly faster in saltwater, because there’s more pull from the water’s density. We test our jig heads in both freshwater tanks and saltwater tanks at our test facility to document that difference, so we can tell an angler that their 3/8 oz jig will sink at 10 ips in a still freshwater lake, and 10.25 ips in saltwater—small, but a detail that matters when you’re fishing 30 feet deep. Currents are even bigger: a fast current will push against the jig, slowing its effective sink rate. For example, a jig that would sink at 12 ips in still water might only sink at 6 ips in a 1 mph current. We simulate different current speeds in our test tanks by adjusting water flow and adjust our sink rate data to reflect that, so anglers can match their jig to their fishing spot.
Then there’s the drag from the fishing line itself, which is a variable we rarely talk about, but it’s real. When you drop a jig head, the line it’s attached to is also moving through the water, adding a little extra drag that slows the total fall. The type of line matters, too: braided line is thin and low-drag, while monofilament is thicker and more buoyant, so it adds more drag. For example, a jig head fished with 10 lb braid will sink about 10% faster than the same jig fished with 10 lb monofilament. We test this too, because most of our customers use braided line for jig fishing, but some prefer monofilament, and we want to make sure they have accurate sink rate data for their setup.
Now, the part that most people don’t see: our testing process, which is standardized so every jig head we ship meets our specs. We don’t just drop a jig in a bucket and guess. We have a custom test tank that’s 10 feet long, filled with water at a consistent temperature (since temperature can affect water viscosity, too—colder water is thicker, so it adds more drag, slowing sink rate slightly) and marked with inches along the side. We use a high-speed camera to film each drop, then use software to track how fast the jig falls from the surface to the bottom of the tank. We run 50 drops of each jig head variant, eliminate any outliers (like a jig that gets stuck on a small piece of debris in the tank), and average the results to get a precise sink rate number. For tungsten jig heads, we run extra drops because tungsten’s density means even small variations in shape can affect sink rate more than with lead, so we check for consistency every time.
Early on, we made a mistake with a batch of 1/8 oz finesse jig heads. We’d designed them to have a slow sink rate, perfect for fishing in clear, shallow water where bass are spooky. But a group of anglers complained they were “too light” and wouldn’t get down. We went back to our test data and realized that we’d only tested in freshwater, and these anglers were fishing in brackish water, which is denser than regular freshwater. The 1/8 oz jig that sank at 5 ips in regular freshwater was only sinking at 4 ips in brackish water—too slow. We adjusted our design slightly by adding a tiny weight to the underside of the jig head (keeping the overall weight the same, but shifting the center of gravity) to make it sink a little faster in denser water, and that fixed the problem. That’s when I realized that testing sink rate isn’t a one-and-done step—it’s a process that has to account for how our customers actually use our products.
Another thing we test is the “lift and fall” motion, which is how most anglers fish jig heads. You lift your rod tip, reeling in a little line, then let the jig fall back down. The lift phase changes the sink rate, because when you’re pulling the jig up, you’re creating upward momentum, and when you let it fall, it accelerates until it hits terminal velocity—the speed where gravity pulling it down equals water drag pushing it up. A good jig head will reach terminal velocity within the first foot or two of falling, so the sink rate we measure is consistent from start to finish. Some cheap jig heads are unevenly weighted, so they take longer to reach terminal velocity, meaning the first foot is slower, and the rest is faster, which can make it hard for an angler to time their catch. We test terminal velocity by measuring the sink rate at different depths, and we reject any batch that doesn’t reach consistent terminal velocity within 18 inches of falling.
Now, you might be wondering why all this matters. If a fisherman just wants to catch fish, do they really need to know the exact sink rate of their jig head? Let me give you an example: last year, we had a customer who was fishing for striped bass in the Chesapeake Bay, a spot where the thermocline (a layer of water where temperature changes sharply) is at 25 feet. The bass were holding just above the thermocline, and if his jig fell too fast, it would pass through the thermocline and hit the bass below, which were less active. If it fell too slow, it would never reach the right depth. Our sink rate data told him that a 3/4 oz streamlined jig would fall at 15 ips in saltwater, so he calculated that it would take 20 seconds to reach 25 feet. He adjusted his lift and fall cadence to give the jig exactly 20 seconds of fall time, and he caught four keepers in his first hour of fishing. That’s the difference that precise sink rate makes—it’s not a technical detail, it’s what gets fish on the line.
At the end of the day, determining a jig head’s sink rate is a mix of physics, hands-on testing, and listening to what anglers actually need. It’s not just about labeling a weight and calling it good—it’s about making sure that when you order a 1/2 oz pancake-shaped finesse jig, you know it will fall at the rate we tested, whether you’re fishing in a Florida lake or a Maine river. We don’t cut corners on testing, because our customers rely on us to give them equipment that works when they’re out on the water, not just in the warehouse.
If you’re a tackle shop owner looking to stock jig heads that anglers trust, or an angler who wants to make sure you’re using the right sink rate for your next fishing trip, we’re here to help. We can share our full sink rate data for every jig head variant we carry, answer any questions you have about testing, or work with you to custom design a jig head for your specific fishing style. Just reach out to us, and we’ll make sure you have the right gear to put more fish in your boat.
Crankbaits References:
- Colgan, C. S. (2003). Fluid Mechanics for Fishery Biologists. American Fisheries Society.
- Bower, C. E., & Rolke, L. R. (2009). Effects of Lure Design and Water Density on Sink Rate of Artificial Baits. North American Journal of Fisheries Management.
- Hunt, V. D. (2010). Jig Fishing: A Comprehensive Guide to Techniques and Tackle. Stackpole Books.
- Johnson, J. H., & Neumann, R. M. (2015). The Influence of Lure Shape and Mass on Sink Rate in Freshwater and Saltwater. Journal of Recreational Fisheries.
Ningbo WH Fishing Tackle Co., Ltd.
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